<?php
/**
 * filename: ext_page.class.php
 * @package:phpbean
 * @author :feifengxlq<feifengxlq#gmail.com>
 * @copyright :Copyright 2006 feifengxlq
 * @license:version 2.0
 * @create:2006-5-31
 * @modify:2006-6-1
 * @modify:feifengxlq 2006-11-4
 * description:超强分页类，四种分页模式，默认采用类似baidu,google的分页风格。
 * 2.0增加功能：支持自定义风格，自定义样式，同时支持PHP4和PHP5,
 * example:
 * 模式四种分页模式：
   require_once('../libs/classes/page.class.php');
   $page=new page(array('total'=>1000,'perpage'=>20));
   echo 'mode:1<br>'.$page->show();
   echo '<hr>mode:2<br>'.$page->show(2);
   echo '<hr>mode:3<br>'.$page->show(3);
   echo '<hr>mode:4<br>'.$page->show(4);
   开启AJAX：
   $ajaxpage=new page(array('total'=>1000,'perpage'=>20,'ajax'=>'ajax_page','page_name'=>'test'));
   echo 'mode:1<br>'.$ajaxpage->show();
   采用继承自定义分页显示模式：
 */
class page 
{
 /**
  * config ,public
  */
 var $page_name="page";//page标签，用来控制url页。比如说xxx.php?PB_page=2中的PB_page
 var $next_page='>';//&raquo;
 var $pre_page='<';//&laquo;
 var $first_page='First';//首页
 var $last_page='Last';//尾页
 var $pre_bar='<<';//上一分页条
 var $next_bar='>>';//下一分页条
 var $format_left='';
 var $format_right='';
 var $is_ajax=false;//是否支持AJAX分页模式 
 
 /**
  * private
  *
  */ 
 var $totalrecord=0;	//记录总数
 var $pagebarnum=5;	//控制记录条的个数, 默认是10
 var $totalpage=0;	//总页数
 var $ajax_action_name='';	//AJAX动作名
 var $nowindex=1;	//当前页
 var $url="";	//url地址头
 var $offset=0;
 var $currentindexstyle="";
 /**
  * constructor构造函数
  *
  * @param array $array['total'],$array['perpage'],$array['nowindex'],$array['url'],$array['ajax']...
  */
 function page($array)
 {
  if(is_array($array)){
     if(!array_key_exists('total',$array))$this->error(__FUNCTION__,'need a param of total');
     $total=intval($array['total']); 
     $perpage=(array_key_exists('perpage',$array))?intval($array['perpage']):10;
     $nowindex=(array_key_exists('nowindex',$array))?intval($array['nowindex']):'';
     $url=(array_key_exists('url',$array))?$array['url']:'';
     $currentindexstyle=(array_key_exists('currentindexstyle',$array))?$array['currentindexstyle']:'';
     $pagebarnum=(array_key_exists('pagebarnum',$array))?$array['pagebarnum']:'5';
  }else{
     $total=$array;
     $perpage=10;
     $nowindex='';
     $url='';
     $currentindexstyle='';
  }
  if((!is_int($total))||($total<0))$this->error(__FUNCTION__,$total.' is not a positive integer!');
  if((!is_int($perpage))||($perpage<=0))$this->error(__FUNCTION__,$perpage.' is not a positive integer!');
  if(!empty($array['page_name']))$this->set('page_name',$array['page_name']);//设置pagename
  $this->_set_nowindex($nowindex);//设置当前页
  $this->_set_url($url);//设置链接地址
  $this->totalpage=ceil($total/$perpage);
  $this->totalrecord=$total;	//设置
  $this->offset=($this->nowindex-1)*$perpage;
  if(!empty($array['ajax']))$this->open_ajax($array['ajax']);//打开AJAX模式
  $this->currentindexstyle=$currentindexstyle;
  $this->pagebarnum=$pagebarnum;
 }
 /**
  * 设定类中指定变量名的值，如果改变量不属于这个类，将throw一个exception
  *
  * @param string $var
  * @param string $value
  */
 function set($var,$value)
 {
  if(in_array($var,get_object_vars($this)))
     $this->$var=$value;
  else {
   $this->error(__FUNCTION__,$var." does not belong to PB_Page!");
  }
  
 }
 /**
  * 打开倒AJAX模式
  *
  * @param string $action 默认ajax触发的动作。
  */
 function open_ajax($action)
 {
  $this->is_ajax=true;
  $this->ajax_action_name=$action;
 }
 /**
  * 获取显示"&raquo;"的代码
  * 
  * @param string $style
  * @return string
  */
 function next_page($style='')
 {
  if($this->nowindex<$this->totalpage){
   return $this->_get_link($this->_get_url($this->nowindex+1),$this->next_page,$style);
  }
  return '<span class="'.$style.'">'.$this->next_page.'</span>';
 }
 
 /**
  * 获取显示“&laquo;”的代码
  *
  * @param string $style
  * @return string
  */
 function pre_page($style='')
 {
  if($this->nowindex>1){
   return $this->_get_link($this->_get_url($this->nowindex-1),$this->pre_page,$style);
  }
  return '<span class="'.$style.'">'.$this->pre_page.'</span>';
 }
 
 /**
  * 获取显示“首页”的代码
  *
  * @return string
  */
 function first_page($style='')
 {
  if($this->nowindex==1){
      return '<span class="'.$style.'">'.$this->first_page.'</span>';
  }
  return $this->_get_link($this->_get_url(1),$this->first_page,$style);
 }
 
 /**
  * 获取显示“尾页”的代码
  *
  * @return string
  */
 function last_page($style='')
 {
  if($this->nowindex==$this->totalpage){
      return '<span class="'.$style.'">'.$this->last_page.'</span>';
  }
  return $this->_get_link($this->_get_url($this->totalpage),$this->last_page,$style);
 }
 
 function nowbar($style='',$nowindex_style='')
 {
  if ($nowindex_style=='') {
  	$nowindex_style="pageindex";
  }
  $plus=ceil($this->pagebarnum/2);
  if($this->pagebarnum-$plus+$this->nowindex>$this->totalpage)$plus=($this->pagebarnum-$this->totalpage+$this->nowindex);
  $begin=$this->nowindex-$plus+1;
  $begin=($begin>=1)?$begin:1;
  $return='';
  for($i=$begin;$i<$begin+$this->pagebarnum;$i++)
  {
   if($i<=$this->totalpage){
    if($i!=$this->nowindex)
        $return.=$this->_get_text($this->_get_link($this->_get_url($i),$i,$style), '0');
    else 
        $return.=$this->_get_text('<span id="currentpage" class="'.$nowindex_style.'">'.$i.'</span>', '1');
   }else{
    break;
   }
   $return.="\n";
  }
  unset($begin);
  return $return;
 }
 
 /**
  * 获取显示跳转按钮的代码
  *window.navigate(this.value)
  * @return string
  */
 function select()
 {
 	if($this->is_ajax){
 	  $return='<select name="PB_Page_Select" id="PB_Page_Select"  onChange="'.$this->ajax_action_name.'(this.value);">';
	  for($i=1;$i<=$this->totalpage;$i++)
	  {
		   if($i==$this->nowindex){
		    	$return.='<option value="'.$i.'" selected>'.$i.'</option>';
		   }else{
		    	$return.='<option value="'.$i.'">'.$i.'</option>';
		   }
	  }
 	}
 	else {
	  $return='<select name="PB_Page_Select"  onChange="window.navigate(this.value);">';
	  for($i=1;$i<=$this->totalpage;$i++)
	  {
	   if($i==$this->nowindex){
	    $return.='<option value="'.$this->url.$i.'" selected>'.$i.'</option>';
	   }else{
	    $return.='<option value="'.$this->url.$i.'">'.$i.'</option>';
	   }
	  }
 	}
  unset($i);
  $return.='</select>';
  return $return;
 }
 
 /**
  * 获取mysql 语句中limit需要的值
  *
  * @return string
  */
 function offset()
 {
  return $this->offset;
 }
 
 /**
  * 控制分页显示风格（你可以增加相应的风格）
  *
  * @param int $mode
  * @return string
  */
 function show($mode=1)
 { 
  switch ($mode)
  {
   case '1':
    $this->next_page='&raquo;';
    $this->pre_page='&laquo;';
    
    return "<nav class=\"text-center\">
  				<ul class=\"pagination\">
					<li><a href=\"javascript:;\">共 ".$this->totalrecord." 记录 共".$this->totalpage." 页</a></li>
    				<li>".$this->pre_page()."</li>
    				<li>".$this->nowbar('', $this->currentindexstyle)."</li>
   	 				<li>".$this->next_page()."</li>
  				</ul>
		</nav>";
    /*
    return "共<span class=\"pagerecord\">".$this->totalrecord."</span>记录&nbsp;共<span class=\"pagerecord\">".$this->totalpage."</span>页&nbsp; ".$this->pre_page(). "&nbsp;&nbsp;" .$this->nowbar('', $this->currentindexstyle).$this->next_page().' &nbsp;第'.$this->select().'页';
    */
    break;
   case '2':
    $this->next_page='&raquo;';
    $this->pre_page='&laquo;';
    $this->first_page='首页';
    $this->last_page='尾页';
    return $this->first_page().$this->pre_page().'[第'.$this->nowindex.'页]'.$this->next_page().$this->last_page().'第'.$this->select().'页';
    break;
   case '3':
    $this->next_page='&raquo;';
    $this->pre_page='&laquo;';
    $this->first_page='首页';
    $this->last_page='尾页';
    return $this->first_page().$this->pre_page().$this->next_page().$this->last_page();
    break;
   case '4':
    $this->next_page='&raquo;';
    $this->pre_page='&laquo;';
    return $this->pre_page().$this->nowbar().$this->next_page();
    break;
   case '5':
    return $this->pre_bar().$this->pre_page().$this->nowbar().$this->next_page().$this->next_bar();
    break;
  }
  
 }
/*----------------private function (私有方法)-----------------------------------------------------------*/
 /**
  * 设置url头地址
  * @param: String $url
  * @return boolean
  */
 function _set_url($url="")
 {
  if(!empty($url)){
      //手动设置
   $this->url=$url.((stristr($url,'?'))?'&':'?').$this->page_name."=";
  }else{
      //自动获取
   if(empty($_SERVER['QUERY_STRING'])){
       //不存在QUERY_STRING时
    $this->url=$_SERVER['REQUEST_URI']."?".$this->page_name."=";
   }else{
       //
    if(stristr($_SERVER['QUERY_STRING'],$this->page_name.'=')){
        //地址存在页面参数
     $this->url=str_replace($this->page_name.'='.$this->nowindex,'',$_SERVER['REQUEST_URI']);
     $last=$this->url[strlen($this->url)-1];
     if($last=='?'||$last=='&'){
         $this->url.=$this->page_name."=";
     }else{
         $this->url.='&'.$this->page_name."=";
     }
    }else{
        //
     $this->url=$_SERVER['REQUEST_URI'].'&'.$this->page_name.'=';
    }//end if    
   }//end if
  }//end if
 }
 
 /**
  * 设置当前页面
  *
  */
 function _set_nowindex($nowindex)
 {
  if(empty($nowindex)){
   //系统获取
   
   if(isset($_GET[$this->page_name])){
    $this->nowindex=intval($_GET[$this->page_name]);
   }
  }else{
      //手动设置
   $this->nowindex=intval($nowindex);
  }
 }
  
 /**
  * 为指定的页面返回地址值
  *
  * @param int $pageno
  * @return string $url
  */
 function _get_url($pageno=1)
 {
  return $this->url.$pageno;
 }
 
 /**
  * 获取分页显示文字，比如说默认情况下_get_text('<a href="">1</a>')将返回[<a href="">1</a>]
  *
  * @param String $str
  * @return string $url
  */ 
 function _get_text($str, $iscurrentindex)
 {
 	$plstr="";
 	if ($iscurrentindex=="1") {
 		$plstr=$str."&nbsp;";
 	}
 	else {
 		$plstr=$this->format_left.$str.$this->format_right."&nbsp;";
 	}
  	return $plstr;
 }
 
 /**
   * 获取链接地址
 */
 function _get_link($url,$text,$style=''){
  $style=(empty($style))?'':'class="'.$style.'"';
  if($this->is_ajax){
      //如果是使用AJAX模式   '<a '.$style.' href="javascript:'.$this->ajax_action_name.'(\''.$url.'\')">'.$text.'</a>';
      $pagelist="";
      if ($text=="&laquo;") {
      	$prevpageno=$this->nowindex-1;
      	$pagelist='<a '.$style.' href="javascript:'.$this->ajax_action_name.'('.$prevpageno.')">'.$text.'</a>';
      }
      elseif ($text=="&raquo;")
      {
      	$prevpageno=$this->nowindex+1;
      	$pagelist='<a '.$style.' href="javascript:'.$this->ajax_action_name.'('.$prevpageno.')">'.$text.'</a>';
      }
      else 
      {
      	$pagelist='<a '.$style.' href="javascript:'.$this->ajax_action_name.'('.$text.')">'.$text.'</a>';
      }
   return $pagelist;
  }else{
   return '<a '.$style.' href="'.$url.'">'.$text.'</a>';
  }
 }
 /**
   * 出错处理方式
 */
 function error($function,$errormsg)
 {
     die('Error in file <b>'.__FILE__.'</b> ,Function <b>'.$function.'()</b> :'.$errormsg);
 }
}
?>